Event: Summer League Division 1

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Opponent Rating Result
Martin Pettinger 1900 ½ - ½
John Trafford 1902 ½ - ½
Robert Porter 1627 1 - 0
Gerald D Fletcher 1809 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1910 = (7238 + 400 * (1 - 0)) / 4)

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